一、前言在测量微小质量、光压和万有引力常数等方面检测微小力的变化时,一般使用这样的方法:把扭矩变换成镜面的旋转,即变换成角位移,用光学方法进行测量。在测量角位移中,一般使用自动准直望远镜。可是市场销售的仪器,检测极限用眼睛读数时是2微弧度,用光电检测时是0.1微弧度。要在上述实验中使用这些仪器,灵敏度是不够的。在必须测量微小角位移的精密实验中,最好使 I. INTRODUCTION In detecting small changes in micro mass, light pressure and gravitational constants, a general method is used to transform a torque into a mirror-like rotation that transforms into an angular displacement and measures it optically. In the measurement of angular displacement, the general use of automatic alignment telescope. But the market of instruments, the detection limit with the eye when the reading is 2 micro-radians, the photoelectric detection is 0.1 micro-radians. To use these instruments in these experiments, the sensitivity is not enough. In the precision test that must measure the tiny angular displacement, it is best to make